feat: add formula screen with unit conversion
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Álvaro González
Álvaro González (aider)
parent
45a9a89c3e
commit
fe89630f53
1 changed files with 227 additions and 0 deletions
227
lib/ai/formula_screen.dart
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227
lib/ai/formula_screen.dart
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import '../formula_models.dart';
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import '../formula_evaluator.dart';
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import '../corpus.dart';
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import 'unit_dropdown.dart';
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class FormulaScreen extends StatefulWidget {
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final Formula formula;
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final UnitCorpus corpus;
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const FormulaScreen({
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super.key,
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required this.formula,
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required this.corpus,
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});
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@override
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State<FormulaScreen> createState() => _FormulaScreenState();
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}
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class _FormulaScreenState extends State<FormulaScreen> {
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final _formKey = GlobalKey<FormState>();
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final Map<String, TextEditingController> _inputControllers = {};
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final Map<String, String?> _selectedUnits = {};
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String? _result;
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String? _selectedOutputUnit;
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@override
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void initState() {
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super.initState();
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// Initialize controllers and units
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for (final input in widget.formula.input) {
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_inputControllers[input.name] = TextEditingController();
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_selectedUnits[input.name] = input.magnitude;
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}
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_selectedOutputUnit = widget.formula.output.magnitude;
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}
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@override
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void dispose() {
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// Clean up controllers
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for (final controller in _inputControllers.values) {
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controller.dispose();
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}
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super.dispose();
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}
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void _evaluateFormula() {
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if (!_formKey.currentState!.validate()) return;
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try {
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final inputValues = <String, dynamic>{};
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for (final input in widget.formula.input) {
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final value = double.tryParse(_inputControllers[input.name]!.text) ?? 0.0;
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// Convert input to base unit if needed
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if (_selectedUnits[input.name] != input.magnitude) {
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inputValues[input.name] = widget.corpus.convert(
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value,
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_selectedUnits[input.name]!,
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input.magnitude,
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);
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} else {
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inputValues[input.name] = value;
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}
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}
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final evaluator = FormulaEvaluator();
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final result = evaluator.evaluate(widget.formula, inputValues);
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// Convert output to selected unit if needed
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if (_selectedOutputUnit != widget.formula.output.magnitude) {
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_result = widget.corpus.convert(
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result,
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widget.formula.output.magnitude,
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_selectedOutputUnit!,
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).toStringAsFixed(2);
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} else {
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_result = result.toStringAsFixed(2);
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}
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setState(() {});
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} catch (e) {
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e
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(
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content: Text('Evaluation error: ${e.toString()}'),
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backgroundColor: Theme.of(context).colorScheme.error,
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),
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);
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}
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: Text(widget.formula.name),
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),
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body: Form(
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key: _formKey,
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child: Padding(
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padding: const EdgeInsets.all(16.0),
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child: Column(
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children: [
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Expanded(
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child: ListView(
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children: [
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_buildInputSection(),
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const SizedBox(height: 24),
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_buildOutputSection(),
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],
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),
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),
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ElevatedButton(
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onPressed: _evaluateFormula,
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child: const Text('Calculate'),
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),
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],
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),
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),
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),
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);
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}
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Widget _buildInputSection() {
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return Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Text(
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'Input Variables',
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style: Theme.of(context).textTheme.titleMedium?.copyWith(
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fontWeight: FontWeight.bold,
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),
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),
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const SizedBox(height: 8),
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...widget.formula.input.map((variable) => _buildVariableRow(variable)),
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],
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);
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}
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Widget _buildOutputSection() {
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return Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Text(
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'Result',
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style: Theme.of(context).textTheme.titleMedium?.copyWith(
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fontWeight: FontWeight.bold,
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),
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),
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const SizedBox(height: 8),
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Row(
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children: [
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Text(widget.formula.output.name),
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const Spacer(),
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SizedBox(
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width: 100,
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child: TextFormField(
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readOnly: true,
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controller: TextEditingController(text: _result),
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decoration: const InputDecoration(
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border: UnderlineInputBorder(),
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),
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),
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),
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const SizedBox(width: 8),
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UnitDropdown(
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corpus: widget.corpus,
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variable: widget.formula.output,
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selectedUnit: _selectedOutputUnit,
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onUnitChanged: (unit) {
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setState(() {
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_selectedOutputUnit = unit;
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});
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},
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),
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],
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),
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],
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);
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}
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Widget _buildVariableRow(VariableSpec variable) {
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return Padding(
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padding: const EdgeInsets.symmetric(vertical: 8.0),
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child: Row(
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children: [
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Text(variable.name),
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const Spacer(),
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SizedBox(
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width: 100,
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child: TextFormField(
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controller: _inputControllers[variable.name],
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keyboardType: TextInputType.number,
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inputFormatters: [
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FilteringTextInputFormatter.allow(RegExp(r'[0-9\.\-]')),
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],
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decoration: const InputDecoration(
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border: UnderlineInputBorder(),
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),
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validator: (value) {
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if (value == null || value.isEmpty) {
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return 'Required';
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}
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return null;
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},
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),
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),
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const SizedBox(width: 8),
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UnitDropdown(
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corpus: widget.corpus,
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variable: variable,
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selectedUnit: _selectedUnits[variable.name],
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onUnitChanged: (unit) {
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setState(() {
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_selectedUnits[variable.name] = unit;
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});
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},
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),
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],
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),
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);
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}
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}
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